Sinn Watch Strap Sizes
Lug width and strap fitting for every Sinn model in our index. Tap a watch for the full guide.
Across the 3 Sinn models with standard lugs in our index, lug widths are 20mm (2), 22mm (1). The most common is 20mm, but don't assume: sizes vary within the brand, so check your exact model below. 1 use fat 2.5mm spring bars, so thick rubber and NATO straps suit them (why that matters).
Sinn lug width chart
| Model | Reference | Strap size | Case | Lug-to-lug |
|---|---|---|---|---|
| 556 | 556 I | 20mm | 38.5mm | 47mm |
| U1 | U1 | 22mm | 44mm | 47mm |
| 104 St Sa I | 104.010 | 20mm | 41mm | — |
Strap size = lug width. Not sure which model you have? Measure it or see the strap size chart for every brand.